frontier

US /frʌnˈtɪr, frɑn-, ˈfrʌnˌtɪr, ˈfrɑn-/

UK /'frʌntɪə(r)/

B1TOEIC
n.NounBorder crossing between countries
This is the eastern frontier of my country
n.NounMost advanced point of development or research
He works on the frontier of Physics research
n.NounUndeveloped land in which very few people live
Life on the American frontier in the 1800's was difficult

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